The term 'Caribou Cousin' refers to two animals, the MOOSE and the ELK. The MOOSE is a large mammal with antlers that is found in North America, Europe, and Asia. It has five letters in its name. The ELK is a species of deer that is native to North America and Eurasia. It has three letters in its name. Both the MOOSE and the ELK are cousins of the Caribou, which is a species of deer found in northern regions of North America and Greenland.